Piston assembly



Dec. 21, 1943.

P. J. M ANDREws mm ASSEMBLY Original Filed Dec 3, 1941 INVENTOR PETER MANDREWS ATTORNEYS Patented Dec. 21, 1943 QFFICE PISTON ASSEMBLY Peter J. McAndrews, Jamaica, N. Y.

Original application December 3, 1941, Serial No. 421,476. Divided and this application May 27, 1942. Serial No. 444.697

3 Claims. (Cl. 3094) (Granted under the act of March 3, 1883, as amended April 30, 1928; 3'70 0. G. 757) The invention described herein may be manis arranged between the pistons 2 and 4 to receive ufactured and used by or for the Government the tie rod. The upper end of the sleeve II enfor governmental purposes, without the payment gages the piston 2 at the inner end of the frustoof any royalty thereon to me. conical shaped cut-out portion I and the lower This invention relates to an improved piston 5 end of the sleeve abuts against the head E5 of the assembly, particularly adapted for use in rime pisto whereby the eve ll a tt g a a movers such as shown in my copending appiicg the adjacent faces of the pistons 2 and 4 provides tion serial No. 421,476, filed December 3, 1941, of a member for holding the dual p st 2 a d 4 in which this application i a di i i spaced relation with each other. In order to It is an object of this invention to provide an rigidly hold e ua p s 2 d 4 and ei improved piston rod the elements of which may connected parts in an assembled condition, a be repaired or replaced without removing the Washer and nut are mounted o t lower primary piston from its cylinde threaded end I of the tie rod. The nut I4 is It is a further object of my invention t proadapted to be screwed on the end I of the tie rod vide an improved piston assembly for use in o o i e washer it int e a ent mechanisms where the compressor piston acts as with a remote face 0f the piston a cross-head. The method of assembly is as follows:

These and other object and advantages of my The tie rod 6' is fed through the hole 9 of the invention will become apparent upon a considerapiston 2 until the head 3 on the upper end of the tion of the following detailed description and the tie rod engages in the recess If desired, this accompanying drawing i which t figur may be a force fit. The sleeve II is then placed resents a view in cross-section of an embodiment Over tie rod of the piston rod construction of my i nti This sleeve is made of sufficient length to prop- Referring more specifically to the drawing, 6 erly Position the piston 2 and the piston The designates generally a piston rod construction intie rod is then fed through the h of the eluding a tie rod 5 and a sleeve I I. The tie rod piStOh 4, Washer Placed on the he rod h 6' is threaded at One end i for engagement with the Whole assembly hghtehed by hut Wlth a compression piston or cross-head 4 and has a the head 3 of the tierod engaging in the recess head a on its other end, which head a is adapted in the Piston 2 and by tightening up on the nut to fitint arecess m f rm dj apl-ston 2 I4, the dual pistons 2 and 4 are brought into The piston 2 is provided with a frusto-conical nment.

By means of my arrangement, it is possible to repair or replace the majority of the elements without removing the primary piston from its cylinder. Since the greatest amount of wear comes on the sleeve I I and the piston 4, this feature represents a great saving in time when makshaped cut-out portion I at its lower end 3 and has a central segmental spherical-shaped cut-out portion 5 in its upper end I5 to provide a small clearance between the top of the piston 2 and the head of the cylinder (not shown) in which the piston 2 is adapted to operate when the piston 2 is at top center in order to produce a high air turbulence mg P repairs or rehlacemehtsand some swirl thereof for a purpose well known Whfle I have described my mventlon Wlth i th t The recess n is centered in the 40 erence to a single embodiment thereof, it is to be per d is and extends from t segmental understood that I do not wish to be limited to the spherical-shaped pgrtjon 5 toward the Hush). particular details and assemblies described, since conical shaped cut-out portion I on the lower end obvious modifications within the Sp Of e 3. A hole 9 having a diameter substantially that vention Will su st t emselves to n skilled in of the tie rod 6' is axially centered in the piston 2 the and extends from the recess III into the frusto- Having bed y invention, at I claim conical shaped cut-out portion I. The upper end as new and Wish t Secure by Letters Patent is: of the head 8 of the tie rod 5' i fl it t 1. A device of the character described comprissurface of the upper end It of the piston 2, thereg d a p s, a piston d ass y holdi by eliminating any obstruction i th l said dual pistons in spaced relation and includance 5. ing a tie rod and a separable sleeve mounted on The head It of the piston d is provided with an the tie rod, said sleeve engaging adjacent faces axially centered hole !2 through Which the of said pistons, a recess formed in a remote face threaded lower end I of the tie rod 6 extends of one of said pistons, and means for placing said and the sleeve II of the piston rod construction 5 tie rod under tension and causing the adjacent faces of the pistons to place said sleeve under compression, said means including a locking device on one end of said tie rod and a head on the other end of said tie rod, said head engaging in said recess.

2. A device of the character described comprising dual pistons, a piston rod assembly holding said dual pistons in spaced relation and including a tie rod and a separable sleeve mounted on the tie rod, one of said pistons having a recess formed in a remote face thereof and a frustoconical shaped cut-out portion formed in an adjacent face, one end of said sleeve removably engaging said first-mentioned piston at an inner end of the frusto-conical shaped cut-out portion and another end of said sleeve engaging an adjacent face of the other of said dual pistons and means for placing said tie rod under tension and causing the adjacent faces of said pistons to place said sleeve under compression, said means including a locking device mounted on one end of said tie rod and a head on the other end of said tie rod, said locking device engaging a remote face of one of said pistons and said head engaging said recess in the other of said pistons.

3. A device of the character described comprising dual pistons, a piston rod assembly holding said dual pistons in spaced relation and including a tie rod and a separable sleeve mounted on the tie rod, one of said pistons having a segmental spherical-shaped cut-out portion on a remote face thereof, a recess centered in said remote face and extending from the segmental spherical-shaped cut-out portion, a frusto-conical shaped cut-out portion formed in an adjacent face of said firstmentioned piston, an axially centered hole extending from said recess into said frusto-conical shaped portion, one end of said sleeve removabiy engaging said first-mentioned piston at an inner end of said frusto-conical shaped portion and another end of said sleeve removably engaging an adjacent face of the other of said dual pistons, and means for placing said tie rod under tension and causing the adjacent faces of said pistons to place said sleeve under compression, said means including a locking device on one end of said tie rod and a head on the other end of said tie rod, said locking device engaging the remote face of the other of said dual pistons and said head engaging said recess in said first-mentioned piston.

PETER J. MCANDREW'S. 

